As we've discussed before, the United Nations expects the population to grow to roughly 11.2 billion people by 2100.
Here's how it'll grow:
You'll notice the slowdown in the charts above - Africa fuels much of the population growth in the middle of the century, while developed countries slow down population growth. Many experience population decline.
Here are the projected populations of countries in 2100:
Japan is interesting, as developed nations go. This is because the Japanese population already peaked in 2009 and has since been declining.
This is because the fertility rate has dropped and the population is ageing.